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class=\u0022name\u0022\u003ESatu Suhonen\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, chief physician\u003C\/span\u003E\u003Ca id=\u0022xref-aff-2-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-2\u0022\u003E2\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-3\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EMaarit Mentula\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, consultant gynaecologist\u003C\/span\u003E\u003Ca id=\u0022xref-aff-3-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-3\u0022\u003E3\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-4\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EElina Hemminki\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, research professor\u003C\/span\u003E\u003Ca id=\u0022xref-aff-4-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-4\u0022\u003E4\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-5\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EOskari Heikinheimo\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, chief physician\u003C\/span\u003E\u003Ca id=\u0022xref-aff-3-2\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-3\u0022\u003E3\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022last\u0022 id=\u0022contrib-6\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EMika Gissler\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, research professor\u003C\/span\u003E\u003Ca id=\u0022xref-aff-4-2\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-4\u0022\u003E4\u003C\/a\u003E\u003Ca id=\u0022xref-aff-5-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-5\u0022\u003E5\u003C\/a\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003Col class=\u0022affiliation-list\u0022\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-1\u0022 name=\u0022aff-1\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E1\u003C\/sup\u003EDepartment of Obstetrics and Gynecology, University Hospital of Oulu, Finland\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-2\u0022 name=\u0022aff-2\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E2\u003C\/sup\u003ECity of Helsinki Health Centre, Unit for Maternal and Child Health Care and Health Promotion, Helsinki, Finland\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-3\u0022 name=\u0022aff-3\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E3\u003C\/sup\u003EDepartment of Obstetrics and Gynaecology\/K\u00e4til\u00f6opisto Hospital, Helsinki University Central Hospital, PO Box 610, 00029 HUS, Helsinki, Finland\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-4\u0022 name=\u0022aff-4\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E4\u003C\/sup\u003ENational Institute for Health and Welfare, Helsinki, Finland\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-5\u0022 name=\u0022aff-5\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E5\u003C\/sup\u003ENordic School of Public Health, Gothenburg, Sweden\u003C\/address\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003Col class=\u0022corresp-list\u0022\u003E\u003Cli class=\u0022corresp\u0022 id=\u0022corresp-1\u0022\u003ECorrespondence to: O Heikinheimo \u003Cspan class=\u0022em-link\u0022\u003E\u003Cspan class=\u0022em-addr\u0022\u003Eoskari.heikinheimo{at}helsinki.fi\u003C\/span\u003E\u003C\/span\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003Cul class=\u0022history-list\u0022\u003E\u003Cli xmlns:hwp=\u0022http:\/\/schema.highwire.org\/Journal\u0022 class=\u0022accepted\u0022 hwp:start=\u00222011-02-20\u0022\u003E\u003Cspan class=\u0022accepted-label\u0022\u003EAccepted \u003C\/span\u003E20 February 2011\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section abstract\u0022 id=\u0022abstract-1\u0022\u003E\u003Ch2\u003EAbstract\u003C\/h2\u003E\u003Cp id=\u0022p-2\u0022\u003E\u003Cstrong\u003EObjective\u003C\/strong\u003E To determine the risks of short term adverse events in adolescent and older women undergoing medical abortion.\u003C\/p\u003E\u003Cp id=\u0022p-3\u0022\u003E\u003Cstrong\u003EDesign\u003C\/strong\u003E Population based retrospective cohort study.\u003C\/p\u003E\u003Cp id=\u0022p-4\u0022\u003E\u003Cstrong\u003ESetting\u003C\/strong\u003E Finnish abortion register 2000-6.\u003C\/p\u003E\u003Cp id=\u0022p-5\u0022\u003E\u003Cstrong\u003EParticipants\u003C\/strong\u003E All women (n=27\u2009030) undergoing medical abortion during 2000-6, with only the first induced abortion analysed for each woman.\u003C\/p\u003E\u003Cp id=\u0022p-6\u0022\u003E\u003Cstrong\u003EMain outcome measures\u003C\/strong\u003E Incidence of adverse events (haemorrhage, infection, incomplete abortion, surgical evacuation, psychiatric morbidity, injury, thromboembolic disease, and death) among adolescent (\u0026lt;18 years) and older (\u226518 years) women through record linkage of Finnish registries and genital \u003Cem\u003EChlamydia trachomatis\u003C\/em\u003E infections detected concomitantly with abortion and linked with data from the abortion register for 2004-6.\u003C\/p\u003E\u003Cp id=\u0022p-7\u0022\u003E\u003Cstrong\u003EResults\u003C\/strong\u003E During 2000-6, 3024 adolescents and 24\u2009006 adults underwent at least one medical abortion. The rate of chlamydia infections was higher in the adolescent cohort (5.7% \u003Cem\u003Ev\u003C\/em\u003E 3.7%, P\u0026lt;0.001). The incidence of adverse events among adolescents was similar or lower than that among the adults. The risks of haemorrhage (adjusted odds ratio 0.87, 95% confidence interval 0.77 to 0.99), incomplete abortion (0.69, 0.59 to 0.82), and surgical evacuation (0.78, 0.67 to 0.90) were lower in the adolescent cohort. In subgroup analysis of primigravid women, the risks of incomplete abortion (0.68, 0.56 to 0.81) and surgical evacuation (0.75, 0.64 to 0.88) were lower in the adolescent cohort. In logistic regression, duration of gestation was the most important risk factor for infection, incomplete abortion, and surgical evacuation.\u003C\/p\u003E\u003Cp id=\u0022p-8\u0022\u003E\u003Cstrong\u003EConclusions\u003C\/strong\u003E The incidence of adverse events after medical abortion was similar or lower among adolescents than among older women. Thus, medical abortion seems to be at least as safe in adolescents as it is in adults.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section intro\u0022 id=\u0022sec-1\u0022\u003E\u003Ch2\u003EIntroduction\u003C\/h2\u003E\u003Cp id=\u0022p-9\u0022\u003EPregnancies among teenagers are mostly unplanned and offer a special challenge to family planning services. Most of all such pregnancies (up to 82% in the United States) are unintended.\u003Ca id=\u0022xref-ref-1-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-1\u0022\u003E1\u003C\/a\u003E The decision to continue or terminate a pregnancy is strongly associated with age. Besides age, being a student or being single are important factors in young women\u2019s decisions on abortion.\u003Ca id=\u0022xref-ref-2-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E In the United States, 6% of all abortions are carried out in under 18s.\u003Ca id=\u0022xref-ref-1-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-1\u0022\u003E1\u003C\/a\u003E In the United Kingdom, 9.5% of abortions in 2009 were in adolescents.\u003Ca id=\u0022xref-ref-3-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-3\u0022\u003E3\u003C\/a\u003E Thus abortions among teenagers are common and are an important public health problem.\u003C\/p\u003E\u003Cp id=\u0022p-10\u0022\u003EThe medical termination of pregnancy using the antiprogestin mifepristone and a prostaglandin analogue has been widely established in several countries during the past decade. In 2009, 40% of abortions were medical in the United Kingdom.\u003Ca id=\u0022xref-ref-3-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-3\u0022\u003E3\u003C\/a\u003E In Sweden and Finland the corresponding figures were 72% and 76%.\u003Ca id=\u0022xref-ref-4-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-4\u0022\u003E4\u003C\/a\u003E \u003Ca id=\u0022xref-ref-5-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-11\u0022\u003EIncreasing use of medical termination of pregnancy points to a need for appropriate studies to confirm its safety in various target groups. Using nationwide register based data we showed that both medical and surgical abortions are generally safe, with few serious complications when gestation is less than 63 days.\u003Ca id=\u0022xref-ref-6-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-6\u0022\u003E6\u003C\/a\u003E The most common adverse events were haemorrhage and incomplete abortion. However, in that study we did not assess the safety of medical abortion among adolescents.\u003C\/p\u003E\u003Cp id=\u0022p-12\u0022\u003EData on the safety of medical abortion among adolescents are limited. In a small prospective study, medical abortion was found to be highly effective and well tolerated in adolescents aged 14 to 17 when gestation was less than 56 days. Initially, half of the participants experienced stress and fear, but these emotions improved significantly within the month after abortion.\u003Ca id=\u0022xref-ref-7-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-7\u0022\u003E7\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-13\u0022\u003EIn the present nationwide study we compared the safety of medical abortion between adolescents and adults. To eliminate the possible influence of previous pregnancies on the outcome of termination of pregnancy, we carried out a subgroup analysis among primigravid women. In addition we assessed the impact of a positive \u003Cem\u003EChlamydia trachomatis\u003C\/em\u003E test result at the time of abortion on the incidence of infections after abortion\u2014a situation of great clinical relevance to adolescents.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section methods\u0022 id=\u0022sec-2\u0022\u003E\u003Ch2\u003EMethods\u003C\/h2\u003E\u003Cp id=\u0022p-14\u0022\u003EFrom the national abortion register compiled by the National Institute for Health and Welfare we identified all women who had undergone induced abortion in Finland during 2000-6. The study population consisted of women who had had a medical abortion (mifepristone alone or in combination with misoprostol or other prostaglandins) at 20 weeks or less of gestation. We divided the women into two cohorts based on age at the time of abortion: adolescents (\u0026lt;18 years) and adults (\u226518 years). To keep the observations independent, we included only the first abortion for women who had more than one during the study period. To assess the potential learning curve in the introduction of medical abortion, we analysed the results in part separately for the first years (2000-3) of its use compared with established use (2004-6). We linked the data with the care register for health institutions (later called the hospital register) and the national infectious diseases register, both compiled by the National Institute for Health and Welfare, and the cause of death register of Statistics Finland. We followed the women for 42 days after the induced abortion and linked all events recorded in the hospital register and cause of death register with the abortion register.\u003C\/p\u003E\u003Cp id=\u0022p-15\u0022\u003EThe Finnish national register on induced abortions and sterilisations has been maintained since 1977. In accordance with the current legislation, doctors performing induced abortions are obliged to report cases to the register within one month, using a specific data collection form. In Finland, data on induced abortions are collected from all hospitals and clinics that carry out induced abortions. The register contains data on women having termination of pregnancy. These data include information on pregnancy history, occupation, type of residence, municipality, and marital status. Data on current pregnancy include information on duration of gestation at the time of abortion, indication for abortion, and method of termination.\u003Ca id=\u0022xref-ref-5-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-16\u0022\u003EWe have previously described Finnish legislation on induced abortion.\u003Ca id=\u0022xref-ref-8-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-8\u0022\u003E8\u003C\/a\u003E Briefly, current legislation permits termination of pregnancy of up to 20 weeks\u2019 gestation (24 weeks in cases of a medical condition of the fetus) for social, medical, or ethical reasons. A national guideline on the care of women seeking abortion was published in 2001 and updated in 2007.\u003Ca id=\u0022xref-ref-9-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-9\u0022\u003E9\u003C\/a\u003E Based on this guideline all women should be screened for \u003Cem\u003EC trachomatis\u003C\/em\u003E and treated if it is present and screened for bacterial vaginosis at the first visit before the termination of pregnancy. Prophylactic antibiotics are not routinely used.\u003C\/p\u003E\u003Cdiv id=\u0022sec-3\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EData collection\u003C\/h3\u003E\u003Cp id=\u0022p-17\u0022\u003EAll hospitals in Finland are required by law to provide the hospital register with information on inpatient treatment (all hospitals) and outpatient visits (public hospitals). This register contains information on diagnosis (international statistical classification of diseases and related health problems, ICD-10\u003Ca id=\u0022xref-ref-10-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-10\u0022\u003E10\u003C\/a\u003E) and treatment (Nordic classification of surgical procedures\u003Ca id=\u0022xref-ref-11-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-11\u0022\u003E11\u003C\/a\u003E), as well as the dates of the treatment episodes. To analyse adverse events related to induced abortion we linked information on the study participants in the hospital register for all hospital inpatient episodes and outpatient visits within 42 days after termination of pregnancy with data in the abortion register. We selected diagnoses and codes for surgical procedures in the cohorts for those considered to be of clinical importance.\u003C\/p\u003E\u003Cp id=\u0022p-18\u0022\u003EWe divided the complications into eight categories (see box): haemorrhage, infection, incomplete abortion, surgical evacuation, psychiatric morbidity, injury or other reason for surgical operation, thromboembolic disease, and death. The classification was based on that reported in the joint study of the Royal College of General Practitioners and the Royal College of Obstetricians and Gynaecologists\u003Ca id=\u0022xref-ref-12-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-12\u0022\u003E12\u003C\/a\u003E and modified for this and our previous study.\u003Ca id=\u0022xref-ref-6-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-6\u0022\u003E6\u003C\/a\u003E\u003C\/p\u003E\u003Cdiv class=\u0022style2\u0022 id=\u0022boxed-text-1\u0022\u003E\u003Cdiv id=\u0022sec-4\u0022 class=\u0022subsection\u0022\u003E\u003Ch4\u003EClassification of adverse events\u003C\/h4\u003E\u003Cul class=\u0022list-unord\u0022 id=\u0022list-1\u0022\u003E\u003Cli id=\u0022list-item-1\u0022\u003E\u003Cp id=\u0022p-19\u0022\u003EHaemorrhage\u2014all reported haemorrhage\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-2\u0022\u003E\u003Cp id=\u0022p-20\u0022\u003EInfection\u2014pelvic inflammatory disease, endometritis, cervicitis, wound infections, pyrexia of unknown origin, urinary tract infections, and septicaemia\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-3\u0022\u003E\u003Cp id=\u0022p-21\u0022\u003EAny reported incomplete abortion\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-4\u0022\u003E\u003Cp id=\u0022p-22\u0022\u003ESurgical evacuation\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-5\u0022\u003E\u003Cp id=\u0022p-23\u0022\u003EPsychiatric morbidity\u2014depression, intoxication, psychoses (ICD-10 codes F10-F48)\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-6\u0022\u003E\u003Cp id=\u0022p-24\u0022\u003EInjury or other reason for surgical operation\u2014all injuries, cervical laceration, uterine perforation, all surgical interventions during follow-up\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-7\u0022\u003E\u003Cp id=\u0022p-25\u0022\u003EThromboembolic disease\u2014pulmonary embolism, deep vein thrombosis\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-8\u0022\u003E\u003Cp id=\u0022p-26\u0022\u003EDeath\u2014death from any cause, pregnancy related death according to the World Health Organization definition\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cp id=\u0022p-27\u0022\u003EThe cause of death register contains data from death certificates and covers all deaths of Finnish citizens and permanent residents in Finland, classified according to ICD-10 codes. All the early deaths (within 42 days of termination of pregnancy) were classified as direct, indirect, or accidental.\u003Ca id=\u0022xref-ref-13-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-13\u0022\u003E13\u003C\/a\u003E \u003C\/p\u003E\u003Cp id=\u0022p-28\u0022\u003EThe National Department of Infectious Disease Epidemiology and Control at the National Institute for Health and Welfare collects information on cases of detected \u003Cem\u003EC trachomatis\u003C\/em\u003E infections. Since 1997 it has been mandatory for laboratories to report all positive cases to the national infectious diseases register based on the Communicable Diseases Act and Decree of 1987.\u003Ca id=\u0022xref-ref-14-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-14\u0022\u003E14\u003C\/a\u003E Since 2004, laboratory notifications have included personal identification numbers, enabling linkage of the data with that in other registries. Since 2004 genital \u003Cem\u003EC trachomatis\u003C\/em\u003E has been detected by DNA or RNA testing.\u003Ca id=\u0022xref-ref-14-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-14\u0022\u003E14\u003C\/a\u003E\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-5\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EStatistical analysis\u003C\/h3\u003E\u003Cp id=\u0022p-29\u0022\u003ETo assess differences between the groups we used the Mann-Whitney test for age and the \u03c7\u003Csup\u003E2\u003C\/sup\u003E test for categorical variables. The \u03c7\u003Csup\u003E2\u003C\/sup\u003E test was also used to calculate the difference in the incidence of adverse events, except for rare ones (psychiatric morbidity, injury, thromboembolic disease, and death) when we used Fisher\u2019s exact test. We used the confidence interval analysis program to calculate the rates of adverse events.\u003Ca id=\u0022xref-ref-15-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-15\u0022\u003E15\u003C\/a\u003E For small proportions we used the exact binomial method. The estimated risks of adverse events were determined by logistic regression analyses, and are presented as odds ratios with 95% confidence intervals. Variables that showed statistically significant associations with complications in univariate analysis (type of residence, marital status, duration of gestation, year of abortion, and adolescent or adult cohort) were further entered in multivariate analysis. SPSS 16.0 for Windows was used for the statistical analyses.\u003C\/p\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section results\u0022 id=\u0022sec-6\u0022\u003E\u003Ch2\u003EResults\u003C\/h2\u003E\u003Cp id=\u0022p-30\u0022\u003EDuring 2000-6, 27\u2009030 women underwent medical abortion between five and 20 weeks of gestation. Of these women, 3024 were younger than 18 (adolescent cohort) and the remaining 24\u2009006 were older (adult cohort). Including only the first induced abortion for each woman during 2000-3, medical abortion was carried out in 1275 (29.3%) adolescents and in 10\u2009459 (31.7%) adults. In 2004-6 the corresponding numbers were 1749 (61.9%) and 13\u2009547 (63.3%).\u003C\/p\u003E\u003Cp id=\u0022p-31\u0022\u003EThe two cohorts differed significantly for various characteristics (table 1\u003Ca id=\u0022xref-table-wrap-1-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#T1\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E). The adolescents had fewer previous deliveries and induced abortions and were more often single and living in a non-urban setting. In both groups, most of the medical abortions (over 80%) were performed before nine weeks of gestation, but the mean duration of gestation was more advanced among adolescents. The incidence of \u003Cem\u003EC trachomatis\u003C\/em\u003E infections, diagnosed four weeks before to six weeks after abortion, was higher in the adolescent cohort, as calculated for 2004-6.\u003C\/p\u003E\u003Cdiv class=\u0022table pos-float\u0022 id=\u0022T1\u0022\u003E\u003Cdiv class=\u0022table\u0022\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 1\u003C\/span\u003E \u003Cp id=\u0022p-32\u0022 class=\u0022first-child\u0022\u003E\u2002Characteristics of the two study cohorts. Values are numbers (percentages) unless stated otherwise\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli\u003E\u003Ca href=\u0022\/highwire\/markup\/593261\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca href=\u0022##\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/593261\/expansion?postprocessors=highwire_figures%2Chighwire_math\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cp id=\u0022p-34\u0022\u003ETable 2\u003Ca id=\u0022xref-table-wrap-2-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#T2\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E describes the incidence of adverse events among the two cohorts, as well as among the primigravid women. The adult cohort had a significantly higher incidence of haemorrhage (3690 (15.4%) \u003Cem\u003Ev\u003C\/em\u003E 386 (12.8%), P\u0026lt;0.001), incomplete abortion (2450 (10.2%) \u003Cem\u003Ev\u003C\/em\u003E 212 (7.0%), P\u0026lt;0.001), and surgical evacuation of retained products of conception (3121 (13.0% \u003Cem\u003Ev\u003C\/em\u003E 333 (11.0%), P=0.002). Odds ratios were calculated for main adverse events (haemorrhage, infection, incomplete abortion, and surgical evacuation), after adjustment for parity, previous abortions, marital status, type of residence, duration of gestation, and year of abortion. In the adolescent cohort the adjusted odds ratios were significantly lower for haemorrhage, incomplete abortion, and surgical evacuation than in the adult cohort. In addition, the adult cohort had more participants with adverse events (5535 (23.1%) \u003Cem\u003Ev\u003C\/em\u003E 575 (19.0%), P\u0026lt;0.001).\u003C\/p\u003E\u003Cdiv class=\u0022table pos-float\u0022 id=\u0022T2\u0022\u003E\u003Cdiv class=\u0022table\u0022\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 2\u003C\/span\u003E \u003Cp id=\u0022p-35\u0022 class=\u0022first-child\u0022\u003E\u2002Incidence of adverse events in study cohorts for all women (3024 adolescents and 24 006 adults) and for primigravid women (2913 adolescents and 10 474 adults)\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli\u003E\u003Ca href=\u0022\/highwire\/markup\/593267\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca href=\u0022##\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/593267\/expansion?postprocessors=highwire_figures%2Chighwire_math\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cp id=\u0022p-39\u0022\u003EIn the subgroup analysis carried out among the primigravid women, the proportion of women with haemorrhage (1505 (14.4%) \u003Cem\u003Ev\u003C\/em\u003E 374 (12.8%), P=0.035), incomplete abortions (887 (8.5%) \u003Cem\u003Ev\u003C\/em\u003E 201 (6.9%), P=0.006) and a higher overall number of adverse events (2224 (21.1%) \u003Cem\u003Ev\u003C\/em\u003E 552 (18.9%), P=0.031) was significantly higher in the adult cohort. After adjustment for marital status, type of residence, duration of gestation, and year of abortion, the risks for incomplete abortion and surgical evacuation were lower in the primigravid adolescents than in the primigravid adults (table 2).\u003C\/p\u003E\u003Cp id=\u0022p-40\u0022\u003EThe incidence of a psychiatric diagnosis was higher among the adolescents in both the cohort and the primigravid cohort, even though the overall numbers were low. Two deaths were reported during the follow-up period. Both of these occurred in adults and were unrelated to the pregnancy (intracranial trauma and melanoma).\u003C\/p\u003E\u003Cp id=\u0022p-41\u0022\u003EThe figure\u003Ca id=\u0022xref-fig-1-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#F1\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E shows the results of logistic regression among the primigravid women for risk of main adverse events (haemorrhage, infection, incomplete abortion, and surgical evacuation). An increased risk of haemorrhage was associated with living in a densely populated area. The risk of bleeding after medical abortion was higher during 2004-6 than during 2000-3. Gestations of 9-12 or 13-16 weeks were associated with a lower risk of haemorrhage than gestations of less than nine weeks. The risk of haemorrhage was also significantly lower in the adolescent cohort.\u003C\/p\u003E\u003Cdiv id=\u0022F1\u0022 class=\u0022fig pos-float odd\u0022\u003E\u003Cdiv class=\u0022fig-inline\u0022\u003E\u003Cdiv class=\u0022highwire-figure\u0022\u003E\u003Cdiv class=\u0022fig-inline-img-wrapper\u0022\u003E\u003Cdiv class=\u0022fig-inline-img\u0022\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/bmj\/342\/bmj.d2111\/F1.large.jpg?width=800\u0026amp;height=600\u0022 title=\u0022Logistic regression analysis of risk factors for main adverse events (haemorrhage, infection, incomplete abortion, and surgical evacuation) among primigravid women in entire cohort. Results of multivariate analysis are shown unless stated otherwise. Variables showing significance in univariate analysis are included. *Derived from univariate analysis\u0022 class=\u0022colorbox fragment-images colorbox-load\u0022 rel=\u0022gallery-fragment-images\u0022 data-figure-caption=\u0022\u0026lt;div class=\u0026quot;highwire-markup\u0026quot;\u0026gt;\u0026lt;div class=\u0026quot;fig-caption\u0026quot; xmlns:xhtml=\u0026quot;http:\/\/www.w3.org\/1999\/xhtml\u0026quot;\u0026gt;\u0026lt;p id=\u0026quot;p-42\u0026quot; class=\u0026quot;first-child\u0026quot;\u0026gt;Logistic regression analysis of risk factors for main adverse events (haemorrhage, infection, incomplete abortion, and surgical evacuation) among primigravid women in entire cohort. Results of multivariate analysis are shown unless stated otherwise. Variables showing significance in univariate analysis are included. *Derived from univariate analysis\u0026lt;\/p\u0026gt;\u0026lt;div class=\u0026quot;sb-div caption-clear\u0026quot;\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;\/div\u0026gt;\u0022\u003E\u003Cimg class=\u0022fragment-image\u0022 src=\u0022https:\/\/www.bmj.com\/content\/bmj\/342\/bmj.d2111\/F1.medium.gif\u0022 alt=\u0022Figure1\u0022\/\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv xmlns:xhtml=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022 class=\u0022fig-caption\u0022\u003E\u003Cp id=\u0022p-42\u0022 class=\u0022first-child\u0022\u003ELogistic regression analysis of risk factors for main adverse events (haemorrhage, infection, incomplete abortion, and surgical evacuation) among primigravid women in entire cohort. Results of multivariate analysis are shown unless stated otherwise. Variables showing significance in univariate analysis are included. *Derived from univariate analysis\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cul class=\u0022highwire-figure-links list-inline\u0022\u003E\u003Cli class=\u0022download-fig first\u0022\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/bmj\/342\/bmj.d2111\/F1.large.jpg?download=true\u0022 class=\u0022highwire-figure-link highwire-figure-link-download\u0022 title=\u0022Download Figure1\u0022\u003EDownload figure\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli class=\u0022new-tab\u0022\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/bmj\/342\/bmj.d2111\/F1.large.jpg\u0022 class=\u0022highwire-figure-link highwire-figure-link-newtab\u0022 target=\u0022_blank\u0022\u003EOpen in new tab\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli class=\u0022download-ppt last\u0022\u003E\u003Ca href=\u0022\/highwire\/powerpoint\/593256\u0022 class=\u0022highwire-figure-link highwire-figure-link-ppt\u0022\u003EDownload powerpoint\u003C\/a\u003E\u003C\/li\u003E\n\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022fig-caption\u0022 xmlns:xhtml=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cp id=\u0022p-43\u0022\u003EAdvanced duration of gestation (9-12, 13-16, and 17-20 weeks) was associated with an increased risk of infections after abortion (figure). Additionally, being married or cohabiting compared with being single was associated with an increased risk of infection. Also, the risk was higher in the later period (2004-6) than in 2000-3. The risk of infection was similar between the two cohorts.\u003C\/p\u003E\u003Cp id=\u0022p-44\u0022\u003EAdvanced duration of gestation was strongly related to the risk of incomplete abortion and surgical evacuation. The risk of incomplete abortion was lower in adolescents (odds ratio 0.69, 95% confidence interval 0.58 to 0.82) than in adults. The risk of surgical evacuation was increased in women living in rural areas and in those who were married or cohabiting. When abortion was carried out in the later period (2004-6) the risk of surgical evacuation was diminished (figure).\u003C\/p\u003E\u003Cp id=\u0022p-45\u0022\u003EThe risk of infections after abortion as a result of concurrent chlamydia infection was assessed among women who underwent abortion during 2004-6. In logistic regression analysis of the whole cohort, the risk of infection after abortion was not associated with concurrent chlamydia infection (1.02, 0.58 to 1.78). Moreover, no significant difference in the rate of infections after abortion emerged between adolescents and those with a positive test result for \u003Cem\u003EC trachomatis\u003C\/em\u003E (data not shown).\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section discussion\u0022 id=\u0022sec-7\u0022\u003E\u003Ch2\u003EDiscussion\u003C\/h2\u003E\u003Cp id=\u0022p-46\u0022\u003EIn the present study the rate of adverse events and complications after medical abortion in adolescents was similar to or lower than that in adults. Various characteristics of the two cohorts differed significantly (table 1), but the risk of adverse events was calculated after adjustment for these factors. This study covered almost all abortions carried out in Finland in all regions and hospitals during a seven year period and thus shows reliable national trends. Earlier studies assessing the completeness of the Finnish abortion register found that 99% of abortions were reported to the register and at least 95% of information matched the medical records.\u003Ca id=\u0022xref-ref-16-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-16\u0022\u003E16\u003C\/a\u003E \u003Ca id=\u0022xref-ref-17-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-17\u0022\u003E17\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-47\u0022\u003EOne limitation of the study is that the registry based data lack detailed information as the diagnoses were made on clinical grounds, and the severity of adverse events may vary substantially. Another drawback is that no conclusions can be made on the effects of abortion beyond the 42 days of follow-up. A further limitation is that data on \u003Cem\u003EC trachomatis\u003C\/em\u003E could only be linked with registry data from 2004, when identification numbers were first archived.\u003C\/p\u003E\u003Cp id=\u0022p-48\u0022\u003EMore women sought help for bleeding after abortion when gestation was less than nine weeks. This finding parallels that reported in our previous study.\u003Ca id=\u0022xref-ref-6-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-6\u0022\u003E6\u003C\/a\u003E This might be explained partly by the fact that medical abortions at nine weeks or more of gestation are carried out by hospitals, and not on an outpatient basis.\u003Ca id=\u0022xref-ref-9-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-9\u0022\u003E9\u003C\/a\u003E Moreover, an increasing number of these early abortions are carried out at home using self administered misoprostol.\u003C\/p\u003E\u003Cp id=\u0022p-49\u0022\u003EThe risk of surgical evacuation of retained products after medical abortion decreased during 2004-6 compared with 2000-3, whereas the number of incomplete abortions remained the same. These findings probably reflect a learning curve in providing medical abortion. However, the lower number of surgical evacuations occurred at the expense of an increased rate of consultations as a result of uterine bleeding. We took into account the possible bias caused by the differences between the study periods (2000-3 and 2004-6) by adjusting the odds ratios of adverse events by study period.\u003C\/p\u003E\u003Cp id=\u0022p-50\u0022\u003EThe rate of infections after abortion was higher (2.0%) than that reported in an earlier review in which medical abortion was assessed (0.9%).\u003Ca id=\u0022xref-ref-18-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-18\u0022\u003E18\u003C\/a\u003E The higher figure may in part be a result of the register based nature of the present study\u2014that is, the diagnostic criteria lacked uniformity. In recent reviews, however, the incidence of infections after medical abortion in the second trimester has been estimated to be about 3%.\u003Ca id=\u0022xref-ref-19-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-19\u0022\u003E19\u003C\/a\u003E \u003Ca id=\u0022xref-ref-20-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-20\u0022\u003E20\u003C\/a\u003E Thus in the present study, concerning pregnancies of up to 20 weeks\u2019 duration, the incidence of infections was comparable with that reported in the recent reviews. The risk of infection was increased when the abortion was carried out in the later period (2004-6). The explanation for this is unclear. The incidence of \u003Cem\u003EC trachomatis\u003C\/em\u003E infections in the Finnish population did not change at the same time.\u003Ca id=\u0022xref-ref-14-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-14\u0022\u003E14\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-51\u0022\u003E\u003Cem\u003EC trachomatis\u003C\/em\u003E is a notable cause of pelvic inflammatory disease. Screening for and treatment of \u003Cem\u003EC trachomatis\u003C\/em\u003E can prevent the development of the disease after abortion.\u003Ca id=\u0022xref-ref-21-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-21\u0022\u003E21\u003C\/a\u003E To prevent infection after termination of pregnancy both prophylactic antibiotic therapy for all and screen and treat strategies are in use. In a recent study in the United States, routine provision of doximycin at the time of medical abortion was associated with a significant reduction in the rate of serious infections.\u003Ca id=\u0022xref-ref-22-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-22\u0022\u003E22\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-52\u0022\u003EWe found no correlation between \u003Cem\u003EC trachomatis\u003C\/em\u003E diagnosed at the time of abortion and subsequent infections. In Finland, systematic screening for \u003Cem\u003EC trachomatis\u003C\/em\u003E after termination of pregnancy is enforced by national guidelines.\u003Ca id=\u0022xref-ref-9-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-9\u0022\u003E9\u003C\/a\u003E In 2004-6 the national incidence of \u003Cem\u003EC trachomatis\u003C\/em\u003E among girls and young women aged 10-19 was 1.7% in Finland,\u003Ca id=\u0022xref-ref-14-4\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-14\u0022\u003E14\u003C\/a\u003E whereas a higher rate of 5.7% was detected in the present adolescent cohort. The results of this study do not rule out the possible association with infections after abortions in the cases of untreated \u003Cem\u003EC trachomatis\u003C\/em\u003E infections, or with delayed antibiotic treatment. The present study suggests that by timely screening it is possible to treat the infection before the clinical manifestation.\u003C\/p\u003E\u003Cp id=\u0022p-53\u0022\u003EIn the present study psychiatric morbidity was significantly more common among adolescents than among adults, although the number of cases was small. Register based studies are not ideal for studying psychiatric disorders, as only some women seek professional help for mental disorders and only some women with mental disorders are treated in specialised healthcare. In a recent register based Danish study, the risk of a psychiatric disorder in women with no such previously detected disorders was not increased after induced abortion in the first trimester.\u003Ca id=\u0022xref-ref-23-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-23\u0022\u003E23\u003C\/a\u003E The risk of psychiatric contact was not, however, significantly affected by age. In a US survey, adolescents were not at increased risk for depression or lower self esteem after abortion than the controls during follow-up.\u003Ca id=\u0022xref-ref-24-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-24\u0022\u003E24\u003C\/a\u003E The present studies only assessed psychiatric diagnoses during the short follow-up but not possible psychiatric morbidity before abortion. Thus the association of mental disorders and termination of pregnancy among adolescents remains unresolved.\u003C\/p\u003E\u003Cp id=\u0022p-54\u0022\u003EExperience of pain or satisfaction with care could not be studied in the present setting, as these outcomes are not registered in the Finnish abortion register. In a randomised study, women with higher gestational age and first pregnancy seemed to be less satisfied with medical abortion as a result of more pain during the termination.\u003Ca id=\u0022xref-ref-25-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-25\u0022\u003E25\u003C\/a\u003E The effective treatment of pain must be taken into account when adolescents, predominantly nulliparous women, undergo induced abortion.\u003C\/p\u003E\u003Cdiv id=\u0022sec-8\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EConclusion\u003C\/h3\u003E\u003Cp id=\u0022p-55\u0022\u003EThe present population based national study provides evidence that medical abortion is not associated with additional risks of adverse events among adolescents in the short term compared with adult women. The data were derived from one country with a homogeneous population but can be generalised to populations with high quality healthcare and easy access to specialist treatment.\u003C\/p\u003E\u003Cdiv class=\u0022style3\u0022 id=\u0022boxed-text-2\u0022\u003E\u003Cdiv id=\u0022sec-9\u0022 class=\u0022subsection\u0022\u003E\u003Ch4\u003EWhat is already known on this topic\u003C\/h4\u003E\u003Cul class=\u0022list-simple\u0022 id=\u0022list-2\u0022\u003E\u003Cli id=\u0022list-item-9\u0022\u003E\u003Cp id=\u0022p-56\u0022\u003ETeenage pregnancies are mostly unplanned and often result in induced abortion\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-10\u0022\u003E\u003Cp id=\u0022p-57\u0022\u003EMedical abortion is increasingly used, albeit its safety has not been properly assessed among adolescents\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-10\u0022 class=\u0022subsection\u0022\u003E\u003Ch4\u003EWhat this study adds\u003C\/h4\u003E\u003Cul class=\u0022list-simple\u0022 id=\u0022list-3\u0022\u003E\u003Cli id=\u0022list-item-11\u0022\u003E\u003Cp id=\u0022p-58\u0022\u003EThe risk of adverse events (haemorrhage, incomplete abortion, infection) after medical abortion is similar or even lower in adolescent (\u0026lt;18 years) compared with adult women\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section notes\u0022 id=\u0022notes-2\u0022\u003E\u003Ch2\u003ENotes\u003C\/h2\u003E\u003Cp id=\u0022p-65\u0022\u003E\u003Cstrong\u003ECite this as:\u003C\/strong\u003E \u003Cem\u003EBMJ\u003C\/em\u003E 2011;342:d2111\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section fn-group\u0022 id=\u0022fn-group-1\u0022\u003E\u003Ch2\u003EFootnotes\u003C\/h2\u003E\u003Cul\u003E\u003Cli class=\u0022fn\u0022 id=\u0022fn-1\u0022\u003E\u003Cp id=\u0022p-59\u0022\u003EThe preliminary results of this study were presented at the International Federation of Obstetrics and Gynecology (FIGO) meeting in Cape Town, South Africa October 2009, and in the International Federation of Professional Abortion and Contraception Associates (FIAPAC) meeting in Seville Spain, October 2010 (MN). We thank Aini Bloigu (National institute for Health and Welfare, Oulu, Finland) for her professional help with the statistics.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn-participating-researchers\u0022 id=\u0022fn-2\u0022\u003E\u003Cp id=\u0022p-60\u0022\u003EContributors: All authors participated in the design of the study. MN carried out the data analysis, wrote the first draft of the manuscript, and is a guarantor of the study. All authors contributed to the subsequent writing of the paper and gave substantial input into the study. OH obtained funding for the study. MG is in charge of the Finnish reproductive registries (including the abortion register).\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn-financial-disclosure\u0022 id=\u0022fn-3\u0022\u003E\u003Cp id=\u0022p-61\u0022\u003EFunding: This study was funded by Finnish Cultural Foundation (MN), Helsinki University Central Hospital Research Funds (OH, MN), and University Hospital of Oulu Research Funds (MN).\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn-conflict\u0022 id=\u0022fn-4\u0022\u003E\u003Cp id=\u0022p-62\u0022\u003ECompeting interests: All authors have completed the Unified Competing Interest form at \u003Ca href=\u0022http:\/\/www.icmje.org\/coi_disclosure.pdf\u0022\u003Ewww.icmje.org\/coi_disclosure.pdf\u003C\/a\u003E (available on request from the corresponding author) and declare: OH has lectured at an educational event organised by Nordic Drugs and has been principal investigator in clinical studies sponsored by the Concept Foundation; no financial relationships with any organisations that might have an interest in the submitted work in the previous three years, no other relationships or activities that could appear to have influenced the submitted work.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn\u0022 id=\u0022fn-5\u0022\u003E\u003Cp id=\u0022p-63\u0022\u003EEthical approval: This study was approved by the ethics committee of the Northern Ostrobothnia Hospital District in October 2005 (No 46\/2005). The Ministry of Social Affairs and Health, and Statistics Finland gave permission for the use of confidential personal level data from the registries. The data protection ombudsman was notified about the data linkage before the analyses, as required by national data protection legislation.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn\u0022 id=\u0022fn-6\u0022\u003E\u003Cp id=\u0022p-64\u0022\u003EData sharing: No additional data available.\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003Cdiv class=\u0022license\u0022 id=\u0022license-1\u0022\u003E\u003Cp id=\u0022p-1\u0022\u003EThis is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: \u003Ca href=\u0022http:\/\/creativecommons.org\/licenses\/by-nc\/2.0\/\u0022\u003Ehttp:\/\/creativecommons.org\/licenses\/by-nc\/2.0\/\u003C\/a\u003E and \u003Ca href=\u0022http:\/\/creativecommons.org\/licenses\/by-nc\/2.0\/legalcode\u0022\u003Ehttp:\/\/creativecommons.org\/licenses\/by-nc\/2.0\/legalcode\u003C\/a\u003E.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section ref-list\u0022 id=\u0022ref-list-1\u0022\u003E\u003Ch2\u003EReferences\u003C\/h2\u003E\u003Col class=\u0022cit-list\u0022\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-1-1\u0022 title=\u0022View reference 1 in text\u0022 id=\u0022ref-1\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-other\u0022 id=\u0022cit-342.apr19_2.d2111.1\u0022\u003E\u003Cdiv class=\u0022cit-metadata unstructured\u0022\u003EJones RK, Finer LB, Singh S. Characteristics of US abortion patients, 2008. Guttmacher Institute, 2010.\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-2-1\u0022 title=\u0022View reference 2 in text\u0022 id=\u0022ref-2\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-342.apr19_2.d2111.2\u0022 data-doi=\u002210.1136\/jech.57.8.601\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003ESihvo S, Bajos N, Ducot B, Kaminski M. 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Mifepristone abortion in minors. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EContraception\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2001\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E64\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E339\u003C\/span\u003E-43.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DContraception%26rft.volume%253D64%26rft.spage%253D339%26rft_id%253Dinfo%253Adoi%252F10.1016%252FS0010-7824%252801%252900296-7%26rft_id%253Dinfo%253Apmid%252F11834231%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=10.1016\/S0010-7824(01)00296-7\u0026amp;link_type=DOI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref\u0022\u003E\u003Cspan\u003ECrossRef\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=11834231\u0026amp;link_type=MED\u0026amp;atom=%2Fbmj%2F342%2Fbmj.d2111.atom\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-medline\u0022\u003E\u003Cspan\u003EPubMed\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=000173855400003\u0026amp;link_type=ISI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-newisilink cit-ref-sprinkles-webofscience\u0022\u003E\u003Cspan\u003EWeb of Science\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-8-1\u0022 title=\u0022View reference 8 in text\u0022 id=\u0022ref-8\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-342.apr19_2.d2111.8\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003ENiinim\u00e4ki M, Pouta A, Bloigu A, Gissler M, Hemminki E, Suhonen S, et al. 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Induced first-trimester abortion and risk of mental disorder. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EN Engl J Med\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2011\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E364\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E332\u003C\/span\u003E-9.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DNew%2BEngland%2BJournal%2Bof%2BMedicine%26rft.stitle%253DNEJM%26rft.issn%253D0028-4793%26rft.aulast%253DMunk-Olsen%26rft.auinit1%253DT.%26rft.volume%253D364%26rft.issue%253D4%26rft.spage%253D332%26rft.epage%253D339%26rft.atitle%253DInduced%2Bfirst-trimester%2Babortion%2Band%2Brisk%2Bof%2Bmental%2Bdisorder.%26rft_id%253Dinfo%253Adoi%252F10.1056%252FNEJMoa0905882%26rft_id%253Dinfo%253Apmid%252F21268725%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=10.1056\/NEJMoa0905882\u0026amp;link_type=DOI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref\u0022\u003E\u003Cspan\u003ECrossRef\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=21268725\u0026amp;link_type=MED\u0026amp;atom=%2Fbmj%2F342%2Fbmj.d2111.atom\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-medline\u0022\u003E\u003Cspan\u003EPubMed\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-24-1\u0022 title=\u0022View reference 24 in text\u0022 id=\u0022ref-24\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-342.apr19_2.d2111.24\u0022 data-doi=\u002210.1363\/4223010\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003EWarren JT, Harvey SM, Henderson JT. Do depression and low self-esteem follow abortion among adolescents? Evidence from a national study. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EPerspect Sex Reprod Health\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2010\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E42\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E230\u003C\/span\u003E-5.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DPerspectives%2Bon%2Bsexual%2Band%2Breproductive%2Bhealth%26rft.stitle%253DPerspect%2BSex%2BReprod%2BHealth%26rft.aulast%253DWarren%26rft.auinit1%253DJ.%2BT.%26rft.volume%253D42%26rft.issue%253D4%26rft.spage%253D230%26rft.epage%253D235%26rft.atitle%253DDo%2Bdepression%2Band%2Blow%2Bself-esteem%2Bfollow%2Babortion%2Bamong%2Badolescents%253F%2BEvidence%2Bfrom%2Ba%2Bnational%2Bstudy.%26rft_id%253Dinfo%253Adoi%252F10.1363%252F4223010%26rft_id%253Dinfo%253Apmid%252F21126298%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=10.1363\/4223010\u0026amp;link_type=DOI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref\u0022\u003E\u003Cspan\u003ECrossRef\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=21126298\u0026amp;link_type=MED\u0026amp;atom=%2Fbmj%2F342%2Fbmj.d2111.atom\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-medline\u0022\u003E\u003Cspan\u003EPubMed\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=000284898300001\u0026amp;link_type=ISI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-newisilink cit-ref-sprinkles-webofscience\u0022\u003E\u003Cspan\u003EWeb of Science\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-25-1\u0022 title=\u0022View reference 25 in text\u0022 id=\u0022ref-25\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-342.apr19_2.d2111.25\u0022 data-doi=\u002210.1016\/j.contraception.2006.10.008\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003ETeal SB, Dempsey-Fanning A, Weshoff C. Predictors of acceptability of medication abortion. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EContraception\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2007\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E75\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E224\u003C\/span\u003E-9.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DContraception%26rft.volume%253D75%26rft.spage%253D224%26rft_id%253Dinfo%253Adoi%252F10.1016%252Fj.contraception.2006.10.008%26rft_id%253Dinfo%253Apmid%252F17303494%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=10.1016\/j.contraception.2006.10.008\u0026amp;link_type=DOI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref\u0022\u003E\u003Cspan\u003ECrossRef\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=17303494\u0026amp;link_type=MED\u0026amp;atom=%2Fbmj%2F342%2Fbmj.d2111.atom\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-medline\u0022\u003E\u003Cspan\u003EPubMed\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=000244550100013\u0026amp;link_type=ISI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-newisilink cit-ref-sprinkles-webofscience\u0022\u003E\u003Cspan\u003EWeb of Science\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003C\/div\u003E\u003Cspan class=\u0022highwire-journal-article-marker-end\u0022\u003E\u003C\/span\u003E\u003C\/div\u003E\u003Cspan id=\u0022related-urls\u0022\u003E\u003C\/span\u003E\u003C\/div\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/342\/bmj.d2111.abstract\u0022 class=\u0022hw-link hw-link-article-abstract\u0022\u003EView Abstract\u003C\/a\u003E\u003C\/div\u003E \u003C\/div\u003E\n\n \n \u003C\/div\u003E\n\u003C\/div\u003E\n \u003C\/div\u003E\n\u003C\/div\u003E\n\u003C\/div\u003E\u003Cscript src=\u0022https:\/\/www.bmj.com\/sites\/default\/files\/js\/js_am8GAfrhW3uXc7HVCmqF3MltMmNunvhyJ6MM_6EffRE.js\u0022\u003E\u003C\/script\u003E\n\u003C\/body\u003E\u003C\/html\u003E"}